Apple cofounder Steve Wozniak has warned about killing off the headphone jack in the iPhone 7

Steve Wozniak, the cofounder of Apple, thinks Apple will frustrate a lot of people if it releases an iPhone 7 without a headphone port.

The Cupertino, California-based company has yet to say whether it intends to remove the headphone jack on the iPhone 7 — expected to hit stores on September 23 — but numerous reports based on leaked images of the handset suggest this is the case.

Assuming there is no headphone jack, those who purchase the new iPhone 7 will have to use Bluetooth headphones or headphones that can be plugged into Apple's Lightning port, which is also used for charging.

"I would not use Bluetooth … I don't like wireless," Wozniak said. "I have cars where you can plug in the music, or go through Bluetooth, and Bluetooth just sounds so flat for the same music."

Removing the headphone port would make existing Apple headphones obsolete. But if the rumors are true, Apple and other audio hardware companies will most likely sell adapters, allowing you to connect your old 3.5 mm headphones to the iPhone's Lightning port.

A leaked image of an iPhone 7 next to a 6s. Austin Evans/YouTube

Wozniak, who founded Apple with Steve Jobs in 1976, gave The Australian Financial Review a bit more insight into the headphones he uses today.

"Mine have custom ear implants, they fit in so comfortably, I can sleep on them and everything," he said. "And they only come out with one kind of jack, so I'll have to go through the adapter.

"If there's a Bluetooth 2 that has higher bandwidth and better quality, that sounds like real music, I would use it. But we'll see. Apple is good at moving towards the future, and I like to follow that."